Nilai

4x+5y = 6
2x-4y = -10 dikali 2
-> 4x+5y = 6 dikurangi
4x-8y = -20
-> 13y = -26
y = 2
4x+5(2) = 6
4x + 10 = 6
4x = 6-10
4x = -4
x = -1
jadi nilai x + 3y = -1 + 3(2)
= -1 + 6 = 5
semoga membantu